Mortising-machine.



Attorneys Patented Mar. 17. 1914.

1 YH w m L E M O H Mm ww WTI T nOA W L tltllltl iliilfi @TATES PATENT @FhlQlE.

\VILLIAM W. MGMURTRY, OF NEW CASTLE, PENNSYLVANIA.

MORTISING-MAC'HINE.

reac es.

To all whom it may concern.

Be it known that I, l ViLLL ur W. lvlclllnnrnr, a citizen of the United States, residing at New Castle, in the county of Lawrence and State of Pennsylvania, have invented a new and useful Mortising-Machine, of which the following is a specification.

One object of the present invention is to provide an attachment which may be assembled readily with the shaft of a boring machine of any standard construction, for the purpose of cutting a rectangular hole in the material.

Another object of the invention is to provide a carrying member of novel lorni, adapted to support the mortising chisel, and adapted to be rotatably mounted upon the shaft 01'' the boring machine, means being provided for holding the carrying member against rotation, and for rotating the carrying member to position the opening properly with. respect to the work.

The invention aims to provide novel means for assembling the carrying member with the shaft of the boring machine, and to provide novel means for assembling the mortising chisel with the carrying member.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinalter described and claimed, it being understood that changes in the precise embodiment oil invention herein disclosed can be made within the scope 01 what is claimed without departing from the spirit of the invention.

In the drawings,Figure 1 shows in side elevation, the device constituting the subjectmatter 01'' the present invention assembled with a boring machine; Fig. 2 is a side elevation of the carrying member and attendant parts; and Fig. 3 is a longitudinal vertical section of the structure shown in Fig. 2.

In the drawings, and referring particularly to Fig. 1, there is shown a boring machine which will be described briefly, it being understood that the device herein dis closed, is adapted to be assembled in boring machines of widely dill'erent forms.

The specific form of boring machine shown in the drawings comprises a supporting post 1, carrying a vertically adjustable work table 2. A bracket 3 is secured to the support 1, the bracket terminating at one end in a vertical bearing 4 in which the bor- Specification of Letters Patent.

Application filed July 8, 1912.

Patented Mar. 17, 191st. Serial No. 708,299.

ing shaft 5 oil the machine is journaled 'l'or rotation. The upper end of the boring shailt 5 is journaled in a yoke (S, but is held againstlongitudinal movement in the yoke, the yoke being pivotally connected with a lever T, fulcrmned upon a link 8 supported by the bracket 3, the lever 7 carrying a counterweight 9. A standard 10 is slidable in a socket 11 which is pivoted to the lever 7, the lower end of the standard 10 being secured to the upper end ot the bearing -11, a stop 12 being zuljustable along the standard 10, for the purpose of limiting the dmvnward swinging movement oi the free end of the lever 7. Dcpemling from one end of the lever 7 is an actuating member .ljl.

The means for imparting rotation to the shaft 5 is shown in the present instance as comprising a friction disk 15 which is se cured lo the shaft 5 below the bearing l, the friction disk being ei'igageable by a 't'riclion wheel 1(' secureiil to a shaft 17 journaled in the bracket 3, any suitable means 18 being provided :tor operalively connecting the shaft 1'7 with a prime mover. A, collar 19 is clamped upon the shalt 5 below the lriction wheel 15, the collar ordinarily consisting oi a pair of slidably inlcrlocking members 20, provided with set screws 21 adapted to engage the shaft 5.

The invention includes a carrying n1emher which is denoted generally by the numeral 22, the carrying member including an upper or primary head 23, a lower or secondary head 24-, and downwardly converging, oppositely disposed arms 25, unit ing the heads. In the upper ilace of the head 23 there is a conical recess Q-Ll, adapted to receive the tapered lower end 27 of the collar 19. In the lower :laee oi the head 93 there is a conical recess 28, adapted to receive the tapered upper end 29 of a collar 30 which may comprise a pair 01 cooperating members 31 held together by a clamp screw 32. From the foregoing it will be evident that the collars 22 and 30 preventthe carrying member 92 from moving longitudinally upon the shaft 5, without interfering with the rotatiim of the carrying member upon the shaft.

A rectangular mortising chisel 33 is pro vided, the same having a shank 3lwhich is inserted into the lower head Q lof the carrying member 522, the chisel being held in place in the carrying member by means of a set screw 36, the chisel being equipped with a laterally projecting shoulder 35, adapted to engage the lower end face of the head 24.

A boring bit 37 is secured in the lower end of the shaft by means of a set screw 38,

5 the bit passing through the axis of the mortising chisel 33. In one or more of the side faces of the mortising chisel 33 there are longitudinal openings 41, through which the chips are discharged. In the upper head 23 of the carrying member 22 there is a transverse opening 39, into which is threaded, or removably secured in any other desired manner, a laterally projecting bar 40.

The collars 19 and 30, it is to be noted,

are rotatably received at their inner ends,

respectively, in the recesses 24 and 28, and

thus, the collars constitute means for cen tering the bit 37 in the mortising chisel 33.

The collars, further, constitute the sole means for supporting the carrying member upon the shaft, and it is to be noted that the carrying member may be adjusted longitudinally of the shaft, by moving and resetting the collars. Further, the collars 25 afford broad bearing areas. The bit-receiving end of the shaft is of the same diameter as the body portion of the shaft, and thus 1 the upper or primary head 23 may be slipped in place around the lower end of the shaft.

The structure herein disclosed may be mounted easily upon the shaft of a boring machine of standard construction, thereby converting the boring machine readily into a mortising machine, without effecting any change either in the bit of the boring machine or in the frame work thereof.

In practical operation, the lever 7 is tilted by means of the actuating member 14: until the lower end of the mortising chisel is brought into close proximity to the work,

the carrying member 22 being rotated manually by means of the bar 450, until the cutting end of the chisel 33 is positioned properly with respect to the work, whereupon the chisel is thrust against the work, the bar 40 being held in order to prevent the carrying member 22 and the chisel 3/3 from rotating. Presupposing that the specific form of driving mechanism shown, is employed, it will be seen that when the shaft 7 is rotated, the friction wheel 16 will rotate the disk 15, the disk 15 rotating the shaft 5 and the shaft-5 rotating the bit 37. The bit 37 will be urged into the work by the action of the lever 7 and, at the same time, the cutting edges of the mortising chisel 33 will be carried downwardly into the work, cutting into rectangle lar form, the circular opening fashioned by the bit 33.

Having thus described the invention, what is claimed is i In a device of the class described, a carrying member comprising primary and sec ondary heads, and a connection between the heads, the primary head having an opening and being provided in its ends with recesses concentric with the opening; a mortising chisel mounted in the secondary head and disposed concentrically with respect tothe 70 opening in the primary head; a shaft located in the opening in the primary head and a bit held in the end of the shaft and projecting into the chisel, the bit-receiving end of the shaft being of the same diameter as the body portion of the shaft, whereby the primary head may be slid onto the bitreceiving end of the shaft; clamping collars detachably secured to the shaft and journaled in the recesses of the primary head, thereby to center the bit in the chisel, the collars constituting the sole means for supporting the carrying member on the shaft, and serving to afford bearing areas.

In testimony that I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

WILLIAM W. MOMURTRY. IVitnesses:

II. MANKIL, R. D. Rossnnt.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. G. 

